package com.hmall.trade.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmall.api.client.CartClient;
import com.hmall.api.client.ItemClient;
import com.hmall.api.config.DefaultFeignConfig;
import com.hmall.api.dto.ItemDTO;
import com.hmall.api.dto.OrderDetailDTO;
import com.hmall.common.exception.BadRequestException;
import com.hmall.common.utils.UserContext;
import com.hmall.trade.constants.MQConstants;
import com.hmall.trade.domain.dto.OrderFormDTO;
import com.hmall.trade.domain.po.Order;
import com.hmall.trade.domain.po.OrderDetail;
import com.hmall.trade.mapper.OrderMapper;
import com.hmall.trade.service.IOrderDetailService;
import com.hmall.trade.service.IOrderService;
import io.seata.spring.annotation.GlobalTransactional;
import lombok.RequiredArgsConstructor;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.cloud.openfeign.EnableFeignClients;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2023-05-05
 */
@Service
@RequiredArgsConstructor
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Order> implements IOrderService {

    private final ItemClient itemClient;
    private final IOrderDetailService detailService;
    private final CartClient cartClient;
    private final RabbitTemplate rabbitTemplate;

    //创建订单
    @Override
    @GlobalTransactional
    public Long createOrder(OrderFormDTO orderFormDTO) {
        // 1.订单数据
        Order order = new Order();
        // 1.1.查询商品
        List<OrderDetailDTO> detailDTOS = orderFormDTO.getDetails();
//        List<OrderDetailDTO> detailDTOS = orderFormDTO.getDetails();
        // 1.2.获取商品id和数量的Map
        Map<Long, Integer> itemNumMap = detailDTOS.stream()
                .collect(Collectors.toMap(OrderDetailDTO::getItemId, OrderDetailDTO::getNum));
        Set<Long> itemIds = itemNumMap.keySet();
        // 1.3.查询商品
        List<ItemDTO> items = itemClient.queryItemByIds(itemIds);
//        List<ItemDTO> items = itemService.queryItemByIds(itemIds);
        if (items == null || items.size() < itemIds.size()) {
            throw new BadRequestException("商品不存在");
        }
        // 1.4.基于商品价格、购买数量计算商品总价：totalFee
        int total = 0;
        for (ItemDTO item : items) {
            total += item.getPrice() * itemNumMap.get(item.getId());
        }
        order.setTotalFee(total);
        // 1.5.其它属性
        order.setPaymentType(orderFormDTO.getPaymentType());
        order.setUserId(UserContext.getUser());
        order.setStatus(1);
        // 1.6.将Order写入数据库order表中
        save(order);

        // 2.保存订单详情
        List<OrderDetail> details = buildDetails(order.getId(), items, itemNumMap);
        detailService.saveBatch(details);

        // 3.清理购物车商品
        cartClient.removeByItemIds(itemIds);
//        cartService.removeByItemIds(itemIds);

        // 4.扣减库存
        try {
           itemClient.deductStock(detailDTOS);
//            itemService.deductStock(detailDTOS);
        } catch (Exception e) {
            throw new RuntimeException("库存不足！");
        }
        System.out.println("++++++++++++++++++++++++++++++");
        //5.发送延迟消息，检测订单支付状态
        rabbitTemplate.convertAndSend(
                MQConstants.DELAY_EXCHANGE_NAME,
                MQConstants.DELAY_ORDER_KEY,
                order.getId(),
                message -> {
                    message.getMessageProperties().setDelay(10000);
                    return message;
                }
        );
        return order.getId();
    }

//    @Override
//    @Transactional
//    public void markOrderPaySuccess(Long orderId) {
////        Order order = new Order();
////        order.setId(orderId);
////        order.setStatus(2);
////        order.setPayTime(LocalDateTime.now());
////        updateById(order);
//
//    }
//@Override
//public void markOrderPaySuccess(Long orderId) {
//    // 1.查询订单
//    Order old = getById(orderId);
//    // 2.判断订单状态
//    if (old == null || old.getStatus() != 1) {
//        // 订单不存在或者订单状态不是1，放弃处理
//        return;
//    }
//    // 3.尝试更新订单
//    Order order = new Order();
//    order.setId(orderId);
//    order.setStatus(2);
//    order.setPayTime(LocalDateTime.now());
//    updateById(order);
//}
@Override
@Transactional
public void markOrderPaySuccess(Long orderId) {
    // UPDATE `order` SET status = ? , pay_time = ? WHERE id = ? AND status = 1
    lambdaUpdate()
            .set(Order::getStatus, 2)
            .set(Order::getPayTime, LocalDateTime.now())
            .eq(Order::getId, orderId)
            .eq(Order::getStatus, 1)
            .update();
}

    @Override
    public void cancelOrder(Long orderId) {
    //将订单状态改为已关闭
        lambdaUpdate()
                .set(Order::getStatus, 5)
                .eq(Order::getId, orderId)
                .eq(Order::getStatus, 1)
                .update();
        //恢复订单中已经扣除的库存
       //根据订单id查询订单详情中的购买信息
        List<OrderDetail> orderDetails = detailService.list(new LambdaQueryWrapper<OrderDetail>()
                .eq(OrderDetail::getOrderId, orderId)
                .select()
        );
        //构建OrderDetailDTO
        List<OrderDetailDTO> detailDTOS = orderDetails.stream()
                .map(orderDetail -> new OrderDetailDTO())
                .toList();
        //调用itemClient.restoreStock(detailDTOS)
        //恢复订单中已经扣除的库存
        itemClient.restoreStock(detailDTOS);
        //TODO 标记订单已关闭
        //TODO 恢复库存
    }

    private List<OrderDetail> buildDetails(Long orderId, List<ItemDTO> items, Map<Long, Integer> numMap) {
        List<OrderDetail> details = new ArrayList<>(items.size());
        for (ItemDTO item : items) {
            OrderDetail detail = new OrderDetail();
            detail.setName(item.getName());
            detail.setSpec(item.getSpec());
            detail.setPrice(item.getPrice());
            detail.setNum(numMap.get(item.getId()));
            detail.setItemId(item.getId());
            detail.setImage(item.getImage());
            detail.setOrderId(orderId);
            details.add(detail);
        }
        return details;
    }
}
